David Tennant (DOCTOR WHO) and Janet Montgomery (ENTOURAGE) star in this adaptation of Alan Furst's celebrated spy novel set in Poland, Paris and Berlin in the years leading up to the Second World War. At the French embassy in Warsaw, the new military attach, Colonel Jean-Francois Mercier (Tennant), is drawn into a world of abduction, betrayal and intrigue in the diplomatic salons and back alleys of the city. At the same time, the handsome aristocrat is involved in a passionate love affair with a Parisian woman of Polish heritage (Montgomery), a lawyer for the League of Nations. Risking his life, Mercier works in the shadows amid a remarkable cast of characters, some known to him as spies, some never to be revealed. It is a city where people drink and fight and spy and love, because no one knows what tomorrow will bring.